COBHAM SOLO4 Spezifikationen PDF herunterladen (Seite 28)

Diversity, Antenna Positioning and Use of Down Converters

Note: Domo down converters can be damaged by static electricity discharge when

connecting antennas. It is suggested that only antennas with built in DC path to ground

are employed to avoid static damage. If this can not be achieved then antennas should be

shorted to ground before connection to the down converter.

The domo SOLO2/SOLO4 receiver is a diversity receiver and will give

optimum results only when two antennas are deployed. The down-

converter boxes should be connected to the receiver, by connecting the

3m TNC cables supplied between the down converter connector

labelled ‘RX / IF OUT’ and the receiver connector labeled ‘IF IN’. Care

should be taken not to over tighten the TNC connectors.

The down-conve

rters convert the RF signal down from microwave

frequencies to the UHF band, which allows the signals to be run along

longer cables without degradation. In the case of the standard domo

SOLO receiver 3 metre long cables are provided, allowing the down-

converters to be positioned remotely from the receiver.

It is important that the down-converter be positioned very close to the

antenna - long cables sh

ould not be used between the antenna and the

down converter because this can degrade system performance.

Typically antennas and down converters will be positioned outside,

usually on the roof of a building or a vehicle. The down-converters can

be located outside, because they are weather proof. However the

receiver is not weather proof and the 3 metre cables should be used to

allow the receiver to be

positioned in an equipment room, rack or

housing.

The domo SOLO2/SOLO4 receiver uses an advanced diversity

technique called maximum ratio combining to construct a good

spectrum from two potentially damaged received signals. To get the

best results from diversity, the antennas should be physically separated

by at least 100cm.

Sometimes better results can be achieved by separating the antennas

further, or

by positioning them of different corners of a building. The

optimum antenna placement depends on the environment in which the

equipment is used and the signal path, and is often limited by physical

factors (accessibility for example).

The domo SOLO2/SOLO4 receiver is supplied without antennas since

the optimum choice of antenna will depend on the operational scenario.

For short range or mobile applicati

ons, omni directional antennas such

as ANT4L, ANT6C or ANT4S will be most suitable whereas for longer

range fixed links, or where mobile transmit activity is happening in a

defined 120 degree arc the higher gain ANT12L or ANT12S will be

more suitable.

Antennas should be screwed directly to the TNC input of the down

converter labeled ‘ANT/RF IN’.

Video Output Connection

Connect the video output lead to the BNC connector labeled ‘VIDEO’ on

the SOLO receiver and to the chosen video display device.

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